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it thereby. ][t is more particularl i am OFFICE.

fililllELlDUN P. TEACHER, F WEEI-IAW KEN, NEW JERSEY, ASSIGNOR T0 REVERERUBBER COMPANY, A GORCE'ORATION 0F RHODE ISLALN D.

PROGES$ FUR VULGAN'IZING RUBBER AND PRODUCT OBTAINED THEREBY.

To all whomit may concern:

Be it known that l, Sr-rnLooN P. Tune,

a citizen of the United States, residin at Weehawken, county of Hudson,and tate of New Jersey, have invented. certain new and usefulImprovements in Processes for Vulcanizing Rubber and Products ObtainedThereby, of which the following is afull, clear, and exact description.

This invention relates to processes for vulcanizingrubber or similarmaterial such as 'gutta percha, balata, synthetic rubber, and materialscommonly classed under the term rubber and to the products obtaineddirected to a process for vulcanizing rub er in the presence of anaccelerator employlng nltroderivatives of the benzene series asvulcanizing agents partially or wholly eliminating no the use of sulfuror sulfur compounds as vulcanizing ingredients; and to the productsresulting. therefrom.

This application is a division of my copending application, Serial No.179,801,

filed July ll, 1917.

'llhe accelerators mentioned and claime in my co-pending applicationreferred to have in themselves a neutral or a whitening action andordinarily where other color 1s. so desired in the vulcanized rubber,suitable colorin ingredients are added.

An 0 ject of the present invention is to employ an agent capable ofperforming the double function of accelerating vulcanizatu tion andcolorin the resultant product.

Heretotore, t e coloring of rubber artielse has been restrictedto colorsobtained only by those materials upon which ,the (sulfur used invulcanization-would have no deleteit rious action. B the employment ofvulcanizing agents sue as the nitro-derivatives of the benzene series,contaming no sulfur, I am enabled to use such colorlng and accelcratingagents as white lead, lead chromate,

it and red lead, and other metallic coloring Inateriala, which couldnotbe used with sulfur as a vulcanizing agent due to their tendency toform metallic sulfide, thus destroytheircolor. 1

be a desir le coloring and accelerating agenhnct only acceleratlng-thevulcanlza- Specification of I'letters Patent.

1 f ed lead particularly has been found to.

Patented Aug. 5, 1919,

Divided and this application tion by nitro-compounds but also actin%1t3provi e a very desirable color to thefinis product.

In carrying out the process using such an 1 accelerator one hundredparts of rubber are ization, such for example, as forming the mixtureinto the desired shapes or articles and subjecting the same to heat andpressure as in the vulcanization by sulfur. The prod-- uct resultingfrom this treatment possesses the generally excellent charactenstics ofcompoundspvulcanized by the nitro-derivatives and in addition has thecolor of red 7 lead. The use'of red lead as a combined accelerator, andcoloring agent has not been found feasible heretofore when with sulfurdue to the fact that destroyed in the vulcanizin process through theformation of lead sulfi and that the accelerator continues curing therubber for a considerable period after the vulcanizing processitselt iscomplete. Red lead when used in dinitrobenzene does not turn black andthe cure is substantially complete at the termination of thevulcanizing. process.

No claim is made to the employment of nitro-compounds or the like per 86as vulcanizing agents. y s many apparently widely different cmthe coloris bodiments of this invention may be made without departing from thespirit thereof, it is to be understood that I do not intend to employedlimit myself to the specific form of the invention as set forthexceptasindicated in the appended claims. I

Having thus described my invention what]; claim and desire to protect byLettersPatentis: l. A process for treating rubber'or similar materialwhich comprises mixing'an' organic vulcanizing agent and red lead withrubber and vulcanizing the mixture.

2. A; process for treating rubber or similar,

g I .-1,s12,144

vulcanizing agent containing no sulfur and her comprising products ofthe action of red red lead With rubber and vulcanizing the lead and avulcanizing agent consisting of mixture. an aromatic nitro-compound.

4. As a new compound, a Vulcanized rub- 7. As a new compound, avulcanized rub- 15 5 her comprising products of the action of red bercomprising roducts of the action of red vlead and a'vulcanizing agentcontaining no lead and dinitro enzene. sulfur. Signed at New York,county of New 5. As a new compound, a vulcanized rub- York, State of NewYork, this second day her comprising products of the action of red ofJanuary, 1918. 10 lead and an organic vulcanizin agent.

6; As a new compound, a vu canized rub-- SHELDON P. TEACHER.

